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#pragma version(1)
#pragma rs java_package_name(com.android.galaxy4)
#include "rs_graphics.rsh"
#pragma stateVertex(parent);
#pragma stateStore(parent);
typedef struct __attribute__((packed, aligned(4))) Particle {
float3 position;
uchar4 color;
} Particle_t;
typedef struct VpConsts {
rs_matrix4x4 MVP;
} VpConsts_t;
VpConsts_t *vpConstants;
// hold clouds
Particle_t *spaceClouds;
// hold bg stars
Particle_t *bgStars;
rs_mesh spaceCloudsMesh;
rs_mesh bgStarsMesh;
rs_program_vertex vertSpaceClouds;
rs_program_vertex vertBgStars;
rs_program_fragment fragSpaceClouds;
rs_program_fragment fragBgStars;
rs_program_vertex vertBg;
rs_program_fragment fragBg;
rs_allocation textureSpaceCloud;
rs_allocation textureFGStar;
rs_allocation textureBg;
static int gGalaxyRadius = 250;
float xOffset;
#define PI 3.1415f
#define TWO_PI 6.283f
/**
* Helper function to generate the stars.
*/
static float randomGauss() {
float x1;
float x2;
float w = 2.f;
while (w >= 1.0f) {
x1 = rsRand(2.0f) - 1.0f;
x2 = rsRand(2.0f) - 1.0f;
w = x1 * x1 + x2 * x2;
}
w = sqrt(-2.0f * log(w) / w);
return x1 * w;
}
static float mapf(float minStart, float minStop, float maxStart, float maxStop, float value) {
return maxStart + (maxStart - maxStop) * ((value - minStart) / (minStop - minStart));
}
void positionParticles(){
rsDebug("************************&&&&&&&&&&&&&&& Called positionBGStars", rsUptimeMillis());
float width = rsgGetWidth();
float height = rsgGetHeight();
float scale = gGalaxyRadius / (width * 0.5f);
// space clouds
Particle_t* particle = spaceClouds;
int size = rsAllocationGetDimX(rsGetAllocation(spaceClouds));
for(int i=0; i<size; i++){
float d = fabs(randomGauss()) * gGalaxyRadius * 0.5f + rsRand(64.0f);
d = mapf(-4.0f, gGalaxyRadius + 4.0f, 0.0f, scale, d);
float id = d / gGalaxyRadius;
float z = randomGauss() * 0.4f * (1.0f - id);
if (d > gGalaxyRadius * 0.15f) {
z *= 0.6f * (1.0f - id);
} else {
z *= 0.72f;
}
particle->position.x = rsRand(TWO_PI);
particle->position.y = d;
particle->position.z = z/5.0f;
particle->color = rsPackColorTo8888(1.0f, 0.0f, 1.0f);
particle++;
}
// bg stars
size = rsAllocationGetDimX(rsGetAllocation(bgStars));
particle = bgStars;
for(int i=0; i<size; i++){
float d = fabs(randomGauss()) * gGalaxyRadius * 0.5f + rsRand(64.0f);
d = mapf(-4.0f, gGalaxyRadius + 4.0f, 0.0f, scale, d);
float id = d / gGalaxyRadius;
float z = randomGauss() * 0.4f * (1.0f - id);
if (d > gGalaxyRadius * 0.15f) {
z *= 0.6f * (1.0f - id);
} else {
z *= 0.72f;
}
particle->position.x = rsRand(TWO_PI);
particle->position.y = d;
particle->position.z = z/5.0f;
particle->color = rsPackColorTo8888(1.0f, 0.0f, 1.0f);
particle++;
}
}
static void drawBg(int width, int height){
rsgBindTexture(fragBg, 0, textureBg);
rsgDrawRect(0.0f, 0.0f, width, height, 0.0f);
}
int root(){
float width = rsgGetWidth();
float height = rsgGetHeight();
rsgClearColor(0.0f, 0.f, 0.f, 0.5f);
// bg
rsgBindProgramVertex(vertBg);
rsgBindProgramFragment(fragBg);
drawBg(width, height);
// space cloud
rsgBindProgramVertex(vertSpaceClouds);
int size = rsAllocationGetDimX(rsGetAllocation(spaceClouds));
Particle_t *particle = spaceClouds;
for(int i=0; i<size; i++){
particle->position.x -= .065;
particle++;
}
rsgBindProgramFragment(fragSpaceClouds);
rsgBindTexture(fragSpaceClouds, 0, textureSpaceCloud);
rsgBindTexture(fragSpaceClouds, 1, textureFGStar);
rsgDrawMesh(spaceCloudsMesh);
// bg stars
rsgBindProgramVertex(vertBgStars);
size = rsAllocationGetDimX(rsGetAllocation(bgStars));
particle = bgStars;
for(int i=0; i<size; i++){
particle->position.x -= .007;
particle++;
}
rsgBindProgramFragment(fragBgStars);
rsgDrawMesh(bgStarsMesh);
return 40;
}
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